题目地址: http://acm.hdu.edu.cn/showproblem.php?pid=1358 求周期问题,简单KMP—— AC代码: #include <iostream> #include <cstdio> #include <cstdlib> #include <cmath> #include <cstring> #include <string> #include <vector> #include &l…

Period 题意:一个长为N (2 <= N <= 1 000 000) 的字符串,问前缀串长度为k(k > 1)是否是一个周期串,即k = A...A;若是则按k从小到大的顺序输出k即周期数: Sample Input 3 aaa 12 aabaabaabaab 0   Sample Output Test case #1 2 2 3 3   Test case #2 2   2 6   2 9   3 12  4  题目其实是来自于LA的..挺好的一道题,用的是原版的kmp.. 写…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=1358 题目大意:给你一串字符串,判断字符串的前缀是否由某些字符串多次重复而构成. 也就是,从第1个字母到第2字母组成的字符串可由某一周期性的字串(“a”) 的两次组成,也就是aa有两个a组成: 第三行自然就是aabaab可有两个aab组成: 第四行aabaabaab可由三个aab组成: 第五行aabaabaabaab可由四个aab组成. 解题思路:同HDU 3746类似,通过计算字符串前缀的循环节获…

题目链接: http://acm.hdu.edu.cn/showproblem.php?pid=1358 题目描述: 给出一个字符串S,输出S的前缀能表达成Ak的所有情况,每种情况输出前缀的结束位置和k. 解题思路: 打表算出next数组,然后对位置i求循环节,如果满足 i % (i - Next[i]) == 0 && Next[i] != 0,所对应的循环节(i - Next[i]), 循环次数是i / (i - Next[i]) #include<cstdio> #inc…

Period Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 4485    Accepted Submission(s): 2163 Problem Description For each prefix of a given string S with N characters (each character has an ASCII…

Period Problem Description For each prefix of a given string S with N characters (each character has an ASCII code between 97 and 126, inclusive), we want to know whether the prefix is a periodic string. That is, for each i (2 <= i <= N) we want to…

题意: 每一个power前缀的周期数(>1). 思路: kmp的next. 每一个前缀都询问一遍. #include <cstring> #include <cstdio> const int MAXN = 1000005; int next[MAXN]; char s[MAXN]; //93MS 5092K void prekmp() { next[0] = -1; int j = -1; for(int i=1;s[i];i++) { while(j!=-1 &&…

<题目链接> 题目大意: 意思是,从第1个字母到第2字母组成的字符串可由某一周期性的字串(“a”) 的两次组成,也就是aa有两个a组成: 第三行自然就是aabaab可有两个aab组成: 第四行aabaabaab可由三个aab组成: 第五行aabaabaabaab可有四个aab组成 解题分析: 求字符串的前缀是否为周期串,若是,打印循环节的长度及循环次数: #include <cstdio> #include <cstring> ; char s[M]; int nxt[…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=3746 Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others) Problem Description CC always becomes very depressed at the end of this month, he has checked his credit card yesterd…

Period Problem's Link: http://acm.hdu.edu.cn/showproblem.php?pid=1358 Mean: 给你一个字符串,让你从第二个字符开始判断当前长度的字符串是否是重复串,如果是,输出当前位置,并输出重复串的周期. analyse: 还是next数组的运用,详见上一篇博客. Time complexity: O(N) Source code:  ;;      ;);      ;      ;)) ))                  );}…

Period Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 2398    Accepted Submission(s): 1187 Problem Description For each prefix of a given string S with N characters (each character has an ASCII…

Period Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 3196    Accepted Submission(s): 1603 Problem Description For each prefix of a given string S with N characters (each character has an ASCII…

Period Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 4325    Accepted Submission(s): 2087 Problem Description For each prefix of a given string S with N characters (each character has an ASCI…

Problem - 1358 KMP求循环节次数.题意是,给出一个长度为n的字符串,要求求出循环节数大于1的所有前缀.可以直接用KMP的方法判断是否有完整的k个循环节,同时计算出当前前缀的循环节的个数. 代码如下: #include <cstdio> #include <cstring> #include <iostream> #include <algorithm> using namespace std; ; char buf[N]; int next[…

思路: 这里只要注意一点,就是失配值和前后缀匹配值的区别,不懂的可以看看这里,这题因为对子串也要判定,所以用前后缀匹配值,其他的按照最小循环节做 代码: #include<iostream> #include<algorithm> const int N = 1000000+5; const int INF = 0x3f3f3f3f; using namespace std; int fail[N]; char p[N]; void getFail(){ fail[0] = -1;…

Period Time Limit : 2000/1000ms (Java/Other)   Memory Limit : 65536/32768K (Java/Other) Total Submission(s) : 53   Accepted Submission(s) : 27 Font: Times New Roman | Verdana | Georgia Font Size: ← → Problem Description For each prefix of a given str…

Period Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 12428    Accepted Submission(s): 5825 Problem Description For each prefix of a given string S with N characters (each character has an ASCI…

题意:统计单串中从某个位置以前有多少重复的串 思路:kmp模板 #include<iostream> #include<stdio.h> #include<string.h> using namespace std; #define MaxSize 1000005 char str[MaxSize]; int next2[MaxSize]; void GetNext(char t[]){ int j,k,len; j=; k=-; next2[]=-; len=strl…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=1358 分析:已知字符串,求其由最小循环节构成的前缀字符串. /*Period Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 3507 Accepted Submission(s): 1766 Problem Description For ea…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=1358 思路:Next数组的用法,在第i个位置上如果有i%(i-Next[i])==0的话最小循环节就是T[0~i],共有i/(i-Next[i])个循环节 题意就是让从第二个位置开始找出有循环的位置节并输出循环节个数 #include<cstdio> #include<iostream> #include<algorithm> #include<math.h>…

Period Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 2866    Accepted Submission(s): 1433 Problem Description For each prefix of a given string S with N characters (each character has an ASCI…

题目大意: 找到所有的可组成连续字符串相连的位置,和循环字符串的个数 #include <cstdio> #include <cstring> #include <algorithm> #include <vector> #include <queue> #include <climits> #include <cmath> #include <cstdlib> using namespace std; #de…

             Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)                         Total Submission(s): 9449    Accepted Submission(s): 4530Problem Description For each prefix of a given string S with N character…

http://acm.hdu.edu.cn/showproblem.php?pid=1358 Period Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 4849    Accepted Submission(s): 2353 Problem Description For each prefix of a given string S…

题意: 给出一个字符串,在所有长度大于1的前缀中,求所有的周期至少为2的周期串,并输出一个周期的长度以及周期的次数. 分析: 有了上一题 HDU 3746 的铺垫,这道题就很容易解决了 把next求出来,然后逐个判断即可. #include <cstdio> #include <cstring> + ; char p[maxn]; int n, next[maxn]; void get_next() { , j = ; next[] = -; while(j < n) { |…

#include<cstdio> #include<cstdlib> #include<cstring> #include<iostream> #include<algorithm> #include<queue> #include<cmath> using namespace std; #define Maxn 1000010 char s[Maxn]; int a[Maxn],nt[Maxn]; int l; void…

由于next[i]保存的是前i-1个字符中最大的重复子序列,那么i-next[i]就是循环节. #include<cstdio> #include<cstring> #include<iostream> using namespace std; ]; void getnext(char *str) { int j,k; memset(next,,sizeof(next)); j=; k=-; next[]=-; while(str[j]) { || str[j]==st…

题目大意:有一个长N的字符串,如果前缀Ni是一个完全循环的串(循环次数大于1),输出Ni和它循环了多少次.   分析:输入next的应用,求出来next数组直接判断Ni是否是完全的循环就行了,也就是Ni % next[i] == 0下面代码 ======================================================================================================================= #include<…

1.HDU 2087 2.题意:一个主串,一个子串,求子串在主串里出现了几次. 3.总结:看了题解,还是不太懂.. //#include<iostream>#include<cmath>#include<queue>#include<algorithm> //不明白为什么加上这些头文件就Compilation Error #include<cstring> #include<cstdio> using namespace std; #…

http://acm.hdu.edu.cn/showproblem.php?pid=1711 首次接触KMP,自己都不是特别理解.在网上百度看了好几个帖子之后,对KMP也有了初步的理解. #include <stdio.h> ], b[], next[]; void getnext( int n) { , j=-; next[]=-; while(i<n) { || b[i]==b[j]) next[++i]=++j; else j=next[j]; } } int KMP(int m,…